You have 8 balls. One of them is defective and weighs less
than others. You have a balance to measure balls against
each other. In 2 weighings how do you find the defective
one?
Answer Posted / fahad sheikh
Divide the 8 balls into three groups
G1: 1,2,3
G2: 4,5,6
G3: 7,8
Weight 1: Weight G1 against G2, if G1=G2 then lighter ball
is in G3. If G1<G2, then lighter ball is in G1 otherwise is
in G2
Weight 2: If lighter ball is in G3, then weight 7 and 8 no
ball against eachother and find the lighter one.
If lighter ball is in G1 or G2 then divide the group into
two further groups
G4: 1,2
G5: 3
Now weight ball no 1 and 2 against eachother. if 1==2 then
defective is 3 otherwise ball with lesser weight is the
lighter one.
Is This Answer Correct ? | 10 Yes | 2 No |
Post New Answer View All Answers
Find the next letter in the series Q,W,E,R,T,--
In a cycle race there are 5 persons named as J, K, L, M, N participated for 5 positions so that in how many number of ways can M make always before N?
A Flight takes off at 2 A.M from northeast direction and travels for 11 hours to reach the destination which is in north west direction.Given the latitude and longitude of source and destination. Find the local time of destination when the flight reaches there?
Ronak's mother is the only daughter of Jasmeet's father. How is Jasmeet's husband related to Ronak?
instead of multiplying by 7 to a number dividing by 7 what is the percentage of error
Find the next letter in the series O,T,T,F,F,S,S--
Aeroplane is flying at a particular angle and latitude,after some time another latitude is given..(8 hrs later), You are asked to find the local time of the place.
In a company 30% are supervisors and 40% employees aare male if 60% of supervisors are male what is the probability that is randomly choosen employee is a male or female?
If a bat costs Rs.30 in the year 1999 and Rs.250 in the year 2000.What is the percent increase in price?
There are two candles with different thickness, but are of equal length. The thicker one lasts of six hours and the thinner candle last for 2 hours less than the thicker one. Suresh lights the two candles at the same time. When he went to bed he saw the thicker one is twice the length of the thinner one. For how long did Suresh light the two candles.
Explain the Binomial theorem?
There are three persons A,B,C .A shots the target 6 times out of 7 shots .B shots 4 out of 5 shots .Then what is the probability of hitting the target twice when 2 persons are selected at random.
if for h hours of work the salary is s and the employee gets x hours of medical leave, then what is the salary/hr ?
A ship went on a voyage after 180 miles a plane statrted with 10 times speed that of the ship. Find the distance when they meet from starting point.
If x,y,z are three consecutive natural numbers, which of the following numbers should be x+y+z